3 winding transformers
3 winding transformers
(OP)
I have got a problem with fault study relating to 3 winding transformers:
For my simulation, a 415v bus connected to the tertiary winding is being supplied by 11kV supply as secondary winding, and a 12.5kV generator as the primary winding. For most cases, the 415V bus gets its voltages from the secondary winding which is the 11kV, if I were to model this scenario:
1. Can I use a two winding transformer to represent the secondary to tertiary arrangments for the fault level at 415V bus and ignoring the three winding arrangment (when the primary side is being open circuited?
2. In relation to 3 winding transformers, is the step down operation in turns (in other words, primary to tertiary first? or secondary to tertiary or both at the same time)
For my simulation, a 415v bus connected to the tertiary winding is being supplied by 11kV supply as secondary winding, and a 12.5kV generator as the primary winding. For most cases, the 415V bus gets its voltages from the secondary winding which is the 11kV, if I were to model this scenario:
1. Can I use a two winding transformer to represent the secondary to tertiary arrangments for the fault level at 415V bus and ignoring the three winding arrangment (when the primary side is being open circuited?
2. In relation to 3 winding transformers, is the step down operation in turns (in other words, primary to tertiary first? or secondary to tertiary or both at the same time)






RE: 3 winding transformers
If your modeling software can't deal with three-winders, you can do a reasonable approximation using two-winding equivalents (you don't have much choice).
RE: 3 winding transformers
I support dpc in that your software should be able to handle at least a three winding transformer.